Re: Fwd: Cannot achieve throughput higher than 460Mbps using CT firmware and 3x3 ath10k

From: Ben Greear <greearb@candelatech.com>
To: richard mayers <richard.mayers92@gmail.com>, ath10k@lists.infradead.org
Subject: Re: Fwd: Cannot achieve throughput higher than 460Mbps using CT firmware and 3x3 ath10k
Date: Thu, 07 May 2015 07:19:27 -0700	[thread overview]
Message-ID: <554B746F.8090803@candelatech.com> (raw)
In-Reply-To: <CAMCCUbhgc6f3kXNy5ESXahA5ypbPBH5dCrYcdp4atEUz9msD4w@mail.gmail.com>

You tried your antenna at different orientations?  Seems they work better
when they are somewhat orthogonal to each other.

Thanks,
Ben

On 05/07/2015 12:52 AM, richard mayers wrote:
> ---------- Forwarded message ----------
> From: richard mayers <richard.mayers92@gmail.com>
> Date: 2015-05-07 9:51 GMT+02:00
> Subject: Re: Cannot achieve throughput higher than 460Mbps using CT
> firmware and 3x3 ath10k
> To: Michal Kazior <michal.kazior@tieto.com>
>
>
> Hi,
>
> Yes, with only one spatial stream I can use MCS9 and I get 290Mbps
> more or less, then with 2 spatial streams I can also use MCS 8, but as
> I said with 3 streams  I only get a "good throughput" with  MC6.
>
> Richard
>
> 2015-05-07 7:47 GMT+02:00 Michal Kazior <michal.kazior@tieto.com>:
>> On 6 May 2015 at 17:01, richard mayers <richard.mayers92@gmail.com> wrote:
>>> Hi all,
>>>
>>> The maximum throughput I get with the following set up is around
>>> 460-470Mbits/s when using MCS 6, 80MHz channel and 3 spatial streams.
>>> However, when I try MCS 7, the throughput drops to 200Mbits/s, and
>>> when I use 8 or 9 it goes to 0. The signal level is -11dBm which I
>>> guess is quite good.
>>
>> Hmm.. From my experience too strong signal can degrade performance
>> with qca988x. You could try reducing it via `iw`. You could also try
>> checking if using only 2 spatial streams also yields problems with
>> MCS8 and MCS9.
>>
>> Antenna themselves might be the problem as well. Strong signal doesn't
>> mean good signal quality. If your antenna connector is damaged or
>> antenna is of poor quality you might end up not being able to use
>> highest MCS rates.
>>
>>
>> Michał
>
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-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com

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